Celluloid is really impressive (configurable concurrency solution) based on what i have seen so far.. a good option for ruby projects.. reducing or zero the learning curve or adoption of the likes of Scala (AKKA) or Erlang etc.. awesome.. soon, gone will be the days when ruby would be mocked for concurrency..

@blackpond: Homebrew by design requires that in your user profile file (i.e. .bashrc or .profile or .bash_profile), that your set /usr/local/bin ahead of /usr/bin to avoid clashes with system software tools that may exist in other paths on your machine. it is important that you override the system paths to use homebrew installations as default.